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我正在嘗試創建一個標題菜單，當我向下滾動它將動畫插入到一個圓中並且它向上滾動時它將會再次返回。我檢查了窗口是頂部，如果沒有，然後與JavaScript動畫。但我的代碼不起作用。使用css創建滾動動畫
$header = $('.header__fake');
$(window).scroll(function() {
var scroll = $(window).scrollTop();
if (scroll > 20) {
$header.addClass('animated').removeClass('fix');
} else {
$header.removeClass('animated').addClass('fix');
}
});body {
background: #02021a url("http://i.imgur.com/705GHlC.jpg") no-repeat 0 0;
-webkit-background-size: 100% auto;
background-size: 100% auto;
color: #fff;
font-family: Helvetica Neue, Helvetica, Open sans, Arial, sans-serif;
font-weight:lighter;
letter-spacing:1px;
}
.content {
width: 320px;
position: relative;
margin: 0 auto;
}
.content h2 {
margin: 35px 0 0;
}
.content h1 {
text-align: center;
margin: 1000px 0 200px;
}
.content h1 span {
display: block;
width: 100%;
margin: 5px 0 0;
opacity: .5;
}
.content .header__fake {
position: fixed;
top: 15px;
left: 50%;
margin-left: -160px;
width: 320px;
}
.content .header__fake i {
display: block;
}
.content .header__fake .btm__border {
height: 1px;
background: #fff;
position: absolute;
bottom: 6px;
left: 0;
right: 0;
-webkit-transition: left 0.5s;
transition: left 0.5s;
}
.content .header__fake .icn__wrap {
cursor: pointer;
float: right;
width: 58px;
position: relative;
height: 58px;
margin-right: -20px;
}
.content .header__fake .icn__wrap .icn__hamburger {
position: absolute;
left: 50%;
top: 50%;
-webkit-transform: translateX(-50%) translateY(-6px);
-ms-transform: translateX(-50%) translateY(-6px);
transform: translateX(-50%) translateY(-6px);
display: block;
width: 18px;
height: 1px;
z-index: 999;
background: #fff;
}
.content .header__fake .icn__wrap .icn__hamburger:after,
.content .header__fake .icn__wrap .icn__hamburger:before {
content: "";
float: left;
display: block;
width: 100%;
height: 1px;
background: #fff;
margin: 5px 0 0;
}
.content .header__fake .icn__wrap .icn__hamburger:before {
margin: 6px 0 0;
}
.content .header__fake .icn__wrap svg {
z-index: 10;
}
.content .header__fake .icn__wrap svg circle {
fill: none;
stroke: #fff;
stroke-width: .5;
stroke-linecap: round;
stroke-linejoin: round;
stroke-dasharray: 39 39;
stroke-dashoffset: -39;
-webkit-transition: stroke-dashoffset 0.5s;
transition: stroke-dashoffset 0.5s;
}
.content .header__fake.animated .btm__border {
left: 100%;
right: 4px;
}
.content .header__fake.animated svg circle {
stroke-dashoffset: 0;
-webkit-transition: stroke-dashoffset 0.5s;
transition: stroke-dashoffset 0.5s;
}
.content .header__fake.fix .btm__border {
-webkit-animation: fix 0.2s linear;
animation: fix 0.2s linear;
-webkit-animation-delay: 0.2s;
animation-delay: 0.2s;
-webkit-animation-fill-mode: forwards;
animation-fill-mode: forwards;
right: 5px;
}
@-webkit-keyframes fix {
from {
right: 5px;
}
to {
right: 0px;
}
}
@keyframes fix {
from {
right: 5px;
}
to {
right: 0px;
}
}<div class="content">
<h2>Scroll to see the magic.</h2>
<div class="header__fake">
<div class="icn__wrap">
<i class="icn__hamburger"></i>
<svg version="1.1" xmlns="http://www.w3.org/2000/svg" width="58px" height="58px" viewBox="0 0 16 16" preserveAspectRatio="none">
<circle cx="8" cy="8" r="6.215" transform="rotate(90 8 8)"></circle>
</svg>
</div>
<i class="btm__border"></i>
</div>
<h1>Hmm<span>Now scroll back up.</span></h1>
</div>
請看下面我的答案。如果這解決了您的問題，請將其標記爲答案，以便此線程可以標記爲「已解決」。如果我的回答無法解決您的問題，請在我的答案下方對問題發表評論，我會研究它。謝謝。 – Bharath